Sinocamaena cheni Wu, gen. et sp. nov., general anatomy A–C holotype, HBUMM08381-spec.1 A lobe-like structure near the anus+ pneumostome B mantle lobe on the left margin of mantle collar C anterior part of the animal, dorsal view, between ommatophore tentacles, showing the head gland where the pore/opening is not obvious D–H paratype, HBUMM08367-spec.1 D lobe-like structure near the anus+ pneumostome E mantle lobe on the left margin of mantle collar F dorsal view of anterior part of the animal, showing the pore among the contractive head gland G internal body wall of head, showing the head gland pore between the ommatophore tentacles H jaw, with basal muscle tissue remaining.